Milwaukee's 4-Gallon Sprayer Tank Assembly w/ SWITCH TANK™ is an interchangeable tank powered by the M18™ Powered Base w/ SWITCH TANK™ (not included). The sprayer tank assembly includes the pump, hose, and wand. The design allows you to add on tank assemblies for different applications, eliminating cross-chemical contamination. The 4-Gallon Sprayer Tank Assembly features a dual diaphragm pump for longer pump life and Viton® seals for increased durability against harsh chemicals. The sprayer tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank. Instant, Constant and Adjustable Pressure for Ultimate Control Add-on Interchangeable Tank Assembly to Eliminate Cross-Chemical Contamination Compatible with: M18™ Powered Base w/ SWITCH TANK (3019-20) Critical seals: Viton® for increased durability against chemicals Dual Diaphragm Pump: For Longer Pump Life Wide Mouth Opening for Easier Pouring High visibility markings for easy fill management Tank identification stickers for easy tank identification Easy access latches for quick tank swaps Onboard measuring cup for easy access